For portable operations (& camping) we use a surface wire grounding kit, what is driven into the ground depends on ground type (and permissions I guess!).
1. Coax passed through a "Alpha Delta UHF Connector Coaxial Cable Surge Protector" mounted on a copper grounding plate. If I *can* drive a grounding rod I have the U clamp thingy, else a simple (cheap) flat copper plate.
2. From the copper plate I run 3x 8ft long 6-8gage (can't remember which, thick) bare copper grounding wire, and about every 2-3ft along the wire there is a 10" tent peg (steel !) connected. These are driven into the ground. They usually can't complain about driving tent pegs in the ground.
This wire assembly rolls up and gets stuffed into a bag - pretty compact and ready-made.
3. Depending on ground quality, dig a shallow hole to "bury" the tent peg, and water the hole.
4. There is a grounding strap from the copper plate to the radio and tuner.
5. Found a youtube video of a commercial version. Mine uses tentpegs from Walmart ...
Tim/KQ1Y